Spark-plttg



G. W. MYERS..

SPARK PLUG. APPLICATION FILED FEB.27, 1919.

Patented Sept. 30, 1919.

Hill Q. 1 VIII UNITED STATES PATENT OFFICE.

GEORGE W. MYERS, 0F PHILADELPHIA, PENNSYLVANIA.

SPABK-PLUG.

Application'filed February 27;. 1919;

To all whom it may concern:

Be it known that I, GEORGE W. MYERS, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Spark-Plugs, of which the following is a specification.

One object of my invention is to provide a spark plug which will be of an eflicient and durable construction and which will prevent current leakage or leakage of the products of combustion when used in connection with an internal combustion engine.

Another object is to so make improved spark plug that it will be devoid of the usual central electrode porcelain insulator and can be quickly and easily manufactured and assembled.

These objects, and other advantageous ends which will be described hereinafter, I attain in the following manner, reference being had to the accompanying drawings in which- Figure 1 is an outside elevation of my improved spark plug, and

, Fig. 2 is a sectional elevation taken on the line 22 of Fig. 1.

Referring to the drawings, 3 represents the metallic body portion of the spar: plug which is extremely screw threaded at 4, so that it can bescrewed in the cylinder of an internal combustion engine, and to facilitate the attachment of said body portion, the upper part thereof is made angular in the form of a nut as shown at 5.

The body portion 3 is made hollow throughout its height and is provided with two internal flanges 6 and 7 which are spaced apart to provide a chamber 8. The flanges 6 and 7 have central holes 9 and 10 respectively. The hole '9 communicates with the chamber 8 and with a cavity 11, while the hole 10 communicates with the chamber 8 and with a cavity 12 formed in the bottom of said body portion. The cavity 11 extends downwardly from the top 13 of the body portion 3 and'has an asbestos washer 14 therein which fits the cavity and is seated upon the top of the flange 6. An asbestosinsulating sleeve 15 fits the upper portion of the cavity 11 and has its top edge 16 projecting above the top 13 of the body por tion 3. The bottom 17 of the sleeve 15 has a hole 18 therein which is of smaller di- Specification of Letters Patent.

Serial No. 279,537.

ameter than the hole 9 and registers with the hole 19 in the washer 14; the hole 19 preferably being of the same diameter as the hole .18 in the bottom 17 of the sleeve 15.

An asbestos washer 20 is fitted within the cavity 12 and abuts the lower surface of the flange 7 A cylindrical paper insulator 21 extendsthrcugh the chamber 8 and the holes 19 and 22 of the washers 14 and 20 respectively. The upper end of the insulator 21 also extends into the hole 18 of the bottom 17 of the sleeve 15. The bottom of the insulator 21 has a flange 23 which fits within the cavity 12 and abuts the lower surface of the washer 20. Another asbestos washer 2i fits within the cavity 12 and abuts the lower surface of the flange 23.

A central electrode 25 has a head 26 and a central stem 27. A copper washer 28 of less diameter than the diameter of the cavity 12, is interposed between the head 26 and the bottom surface of the washer 24- in such manner that the stem 27 extends through said washer 28. The stem 27 also passes through the washer 24 and insulator 22. The upper portion of the stem 27 is screw threaded and provided with a nut 28 having a cy- Patented. Sept. 30, 1919.,

lindrical portion 29 which fits within the sleeve 15 and is adapted to abut the upper surface of the bottom 17. The length of the insulator 21 is such that it nor-malty does not extend entirely through the hole 18 of the sleeve bgttom 17 and thus provides a space 30 between the'nut 28 and the top of the insulator 21.

It will thus be seen that by screwing down on the nut 28 the members between the nut and the head 26 of the insulator 25 will be compressed and thereby tightly fit Within thezrespective cavities 11 and 12 to prevent leakage of the products of combustion, and the electrode will be completely insulated from the body portion 3. In other words, by tightening the nut 28 all of the elements within the cavities 11 and 12 will be placed under compression so as to tightly fit said cavities and also form a seal. around the insulator 21.

-A second electrode 31 is attached to the 105 body portion 3 and includes a curved mem- 33 and the head 26 provides a gap across which the spark travels.

The extreme upper end or the electrode is provided with a binding nut t'c'or the attachment of the usual electric wire.

By providing the chamber 8 between flanges 6 and 7 a cool zone is provided arou the cylindrical portion of the electrode in sulator 21 and also serves as means for preventing transverse current leakage.

With the construction above described it is unnecessary to provide a porcelain casing for a central electrode in a spark plug; and I am \enabled therefore to provide] 7 much compression with the nut as is necc y to form a complete seal as above ribc While I have described my imenti taking a particular form, it will. be nu V stood that the various parts of n v invention may be, changed Without departing from the spirit thereof, and hence I do not limit myself to the precise construction set forth, but consider that I am at liberty to make such changes and alterations as fairly come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. YA spark plug including a hollow body a central electrode insulator within said hol-- low body, said body having a chamber formed therein by inwardly emending lian within itslength to provide an insulating space between the insulator and said body; substantially as described.

2. A spark plug including a hollow body having inwardly extending flanges spaced apart to provide a chamber therebetween and cavities at the opposite ends of said body; an electrode insulator extending through said chamber; an electrode eXtcnding through said insulator and having a head thereon; means Within one of said cavities between said head and the insulator; means in the other of said cavities having portions in engagement with said insulator; and a. nut on said electrode and adapted to compress said means within the latter mentioned cavity and also operative to cause the head rt spark plug including a'holl'ow body hav lnw by extending flanges spaced art to pro vide a chamber therebetwcen and cavities at the opposite ends of said body;

an electrode insulator extending through S l Cl1fl-111l)Q.? and having a flange located hione or said cavities; an electrode extendin tln'ough said insulator and having a head thereon; n'ieans within said latter cavity between said head and said flange of the electrode insulator; means in the other of caviti s having portioi'is in engagement ilatcr; and a nut on said electo compress said means mentioned: cavity and also operative cause the head of said electrode to compress the means in the other of said cavities whereby a seal is provided for said insulator; s! uitially as described.

4-. A spars plug inchiding a hollow body having inwardly extending flanges spaced apart to provide a chamber therebetwcen and cavities at the opposite ends of said body; an electrode insulator extending through said chamber and having a flange located within one of said cavities; an electrode extending through said insulator and having a head thereon; means within said latter cavity between said head and said flange of the electrode insulator; a sleeve in the other of said cavities and having a portion in engagement with said insulator; and a nut screwed on said electrode and hava portion in engagement with said sleeve whereby when the nut is turned said sleeve will be compressed into engagement with said insulator; substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

enonen w. MYERS.

l V'itne sses Benson PnILLiPs, E. A. Census, Jr. 

